Top Plaza 1x Watch Case Opener Adjustable Wrench Tool, Watch Back Cover Opener Remover Repair Kit Jaw distance adjustable from 8mm to 57mm Size: Approx 70mm X 40mm X 11mm (Two tips of this work in the same way,would be sent random ) Weight: Approx 80g/ Material: Steel Simple to Use and Fully Adjustable Suitable for open Back case on Most Watches.